An object is propelled vertically upward from the top of a 144-foot building.

An object is propelled vertically upward from the top of a 144-foot building. The quadratic function s(t)=-16t^2+176t+144 models the ball's height above the ground, s(t) in feet, t seconds after it was thrown. How many seconds does it take until the object finally hits the ground? Round to the nearest tenth of a second if necessary